A Bone anchoring assembly is provided, comprising: a bone anchoring element (1, 20) having a shank (2, 22) to be anchored in a bone or a vertebrae, and a receiving part (3, 25) for receiving a rod (9) a rod made at least partly of a material which exhibits a material flow under pressure the receiving part (3, 25) comprising a channel (4, 36) with an approximately U-shaped cross-section with two free legs (5, 6, 37, 38) a first locking element (11, 101) cooperating with the legs to secure the rod in the channel, a second locking element (12, 102) cooperating with the first locking element and acting independently from the first locking element onto the rod wherein a pin-shaped projection (15, 105) is provided at the second locking element (12, 102) which comes into contact with the rod when tightening the second locking element and wherein at least one pin-shaped projection (13a, 13b, 40a, 40b) is provided in the channel which comes into contact with the rod when tightening the first locking element.本案提供一種骨骼固定總成,包括:骨骼固定元件(1,20),有幹部(2,22)要固定於骨骼或椎骨;和容納件(3,25)供容納桿件(9);桿至少部份係由壓力下顯示材料流動之材料所製成;容納件(3,25)包括凹溝(4,36),大約呈U形斷面,有二自由股部(5,6,37,38);第一鎖定元件(11,101)與股部合作,把桿件保固於凹溝內,第二鎖定元件(12,102)與第一鎖定元件合作,與第一鎖定元件分開作用於桿件,其中:在第二鎖定元件(12,102)設有銷形凸部(15,105),在第二鎖定元件旋緊時,與桿件接觸,又其中在第一鎖定元件旋緊時,與桿件接觸之凹溝,設有至少一銷形凸部(13a,13b,40a,40b)。1...骨骼固定元件2...幹部3...容納件4...U形凹部5,6...自由股部7...陰螺紋7a...肩部8...底座9...桿件10...鎖定裝置11...外鎖定螺釘11a...共軸螺紋徑孔12...內鎖定螺釘12a...環形凸部12b...共軸圓形凹部13a,13b...銷形凸部15...共軸銷
